Operating Instructions: ATOM
Two Safety Outputs
Two Safety Inputs
Dual channel OSSD outputs with “low” voltage to indicate the
safe state.
Must be connected to the next OSSD Device or an external
evaluation device.
The External Evaluation Device must:
• Monitor both signals are high before it can leave its safe
state
• Monitor that both signals are synchronous
• Have a Diagnostic Coverage of at least 99%
Dual channel safety inputs with “low” voltage to indicate the
safe state
Must be connected to the previous OSSD device or 24V
A fault will be detected if the inputs are not synchronous (see
timing fault diagram). A full input cycle is needed to clear the
fault.
Solenoid Drive Input
Monitor Output
Solenoid Drive input with “high” voltage to activate the
solenoid.
For Power-to-release (unlock) (PTU) devices the solenoid will
unlock the device.
For Power-to-lock (PTL) devices the solenoid will lock the
device.
For Safety-on-Guard-Locking (SOGL) devices the input must
be driven from a safe and monitored source to be able to
achieve PLe.
Control output with “high” voltage to indicate active condition
For Safety-on-Guard-Locking (SOGL) devices the monitor is
activated when the gate is opened.
For Safety-on-Guard (SOG) devices the monitors is activated
when the device is unlocked.
Daisy Chain information
The number of devices that can be wired in series depends on two main criteria:
1.
Power line voltage drop
2.
Total Safety Response Time
Voltage Drop
Safety Response Time
Each ATOM Device in series draws current and causes a
voltage drop on the power line.
The greater the number of d distance, the grater the
voltage drop.
The voltage requirement for ATOM is 24+10%-15%, this
means the voltage must not drop below 20.4V to ensure
correct operation.
A typical application with devices spaced 5m apart, wired with
22 AWG cable would allow for 4 devices in series. For more
detailed calculation please see the Voltage Drop Tool on the
Fortress website.
The maximum number of devices permitted in series is 8.
Each ATOM Device in series will increase the total safety
response time of the line.
The maximum safety response time for one device is 200ms.
The increase response time per additional device is 25ms.
The total response time can be calculated using:
T = 200ms + (n-1)x25ms, where n = the number of ATOM
devices in the line
Safety Input 1
Safety Input 2
a
a
Simultaneity fault:
If a > 50ms
Safety Inputs Timing Faults
Wiring Diagram
Voltage Supply
Safety Outputs
+24V DC
Solenoid Input
0V
2
7
5
8
3
4
Safety Inputs
1
6
ATOM 8 Pin M12
Gate
（
SOGL
）
or Locking
（
SOG
）
Monitor
5
